<template>
  <div class="root">
    <div class="todo-container">
      <div class="todo-wrap">
        <MyHeader :addTodo="addTodo" />
        <MyList :todos="todos" />
        <MyFooter
          :todos="todos"
          :checkAllTodo="checkAllTodo"
          :clearAllTodo="clearAllTodo"
        />
      </div>
    </div>
  </div>
</template>

<script>
import pubsub from 'pubsub-js'
import MyHeader from './components/MyHeader'
import MyFooter from './components/MyFooter'
import MyList from './components/MyList'
export default {
  name: 'App',
  components: {
    MyHeader,
    MyFooter,
    MyList,
  },
  data() {
    return {
      todos: [
        { id: '001', title: '写代码', done: true },
        { id: '002', title: '追剧', done: false },
        { id: '003', title: '打游戏', done: true },
      ],
    }
  },
  methods: {
    //添加一个todo
    addTodo(todoObj) {
      this.todos.unshift(todoObj)
    },
    //检查单选框是否勾选or未勾选
    checkTodo(id) {
      this.todos.forEach((todo) => {
        if (todo.id === id) todo.done = !todo.done
      })
    },
    //删除一个todo
    deleteTodo(_, id) {
      //返回为true代表测试通过，保留元素，为false不保留
      this.todos = this.todos.filter((todo) => {
        return todo.id !== id
      })
    },
    //全选或全不选
    checkAllTodo(done) {
      this.todos.forEach((todo) => {
        todo.done = done
      })
    },
    //清除已选
    clearAllTodo(done) {
      //过滤出未勾选的todo
      this.todos = this.todos.filter((todo) => {
        return !todo.done
      })
    },
  },
  watch: {
    todos: {
      deep: true,
      handler(value) {
        localStorage.setItem('todos', JSON.stringify(value))
      },
    },
  },
  mounted() {
    // this.$bus.$on('checkTodo', this.checkTodo)
    // this.$bus.$on('deleteTodo', this.deleteTodo)
    this.checkId = pubsub.subscribe('checkTodo', this.checkTodo)
    this.pubId = pubsub.subscribe('deleteTodo', this.deleteTodo)
  },
  beforeDestroy() {
    // this.$bus.$off(['checkTodo'])
    pubsub.unsubscribe(this.checkId)
    pubsub.unsubscribe(this.pubId)
  },
}
</script>

<style type="text/css">
/*base*/
body {
  background: #fff;
}

.btn {
  display: inline-block;
  padding: 4px 12px;
  margin-bottom: 0;
  font-size: 14px;
  line-height: 20px;
  text-align: center;
  vertical-align: middle;
  cursor: pointer;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2),
    0 1px 2px rgba(0, 0, 0, 0.05);
  border-radius: 4px;
}

.btn-danger {
  color: #fff;
  background-color: #da4f49;
  border: 1px solid #bd362f;
  margin-left: 5px;
}
.btn-edit {
  color: #fff;
  background-color: skyblue;
  border: 1px solid rgb(148, 213, 238);
}

.btn-danger:hover {
  color: #fff;
  background-color: #bd362f;
}

.btn:focus {
  outline: none;
}

.todo-container {
  width: 600px;
  margin: 0 auto;
}
.todo-container .todo-wrap {
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 5px;
}
</style>
